EP0026493A1 - Apparat zum in Kontakt Bringen einer Flüssigkeit mit einem Gas - Google Patents

Apparat zum in Kontakt Bringen einer Flüssigkeit mit einem Gas Download PDF

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Publication number
EP0026493A1
EP0026493A1 EP19800105915 EP80105915A EP0026493A1 EP 0026493 A1 EP0026493 A1 EP 0026493A1 EP 19800105915 EP19800105915 EP 19800105915 EP 80105915 A EP80105915 A EP 80105915A EP 0026493 A1 EP0026493 A1 EP 0026493A1
Authority
EP
European Patent Office
Prior art keywords
draft member
liquid
tank
impeller
gas
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP19800105915
Other languages
English (en)
French (fr)
Other versions
EP0026493B1 (de
Inventor
Winfred Roeckel
Carl Scaccia
John Alfonse Conti
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Union Carbide Corp
Original Assignee
Union Carbide Corp
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by Union Carbide Corp filed Critical Union Carbide Corp
Publication of EP0026493A1 publication Critical patent/EP0026493A1/de
Application granted granted Critical
Publication of EP0026493B1 publication Critical patent/EP0026493B1/de
Expired legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/20—Activated sludge processes using diffusers
    • C02F3/205—Moving, e.g. rotary, diffusers; Stationary diffusers with moving, e.g. rotary, distributors
    • C02F3/206—Moving, e.g. rotary, diffusers; Stationary diffusers with moving, e.g. rotary, distributors with helical screw impellers
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B01—PHYSICAL OR CHEMICAL PROCESSES OR APPARATUS IN GENERAL
    • B01F—MIXING, e.g. DISSOLVING, EMULSIFYING OR DISPERSING
    • B01F23/00—Mixing according to the phases to be mixed, e.g. dispersing or emulsifying
    • B01F23/20—Mixing gases with liquids
    • B01F23/23—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids
    • B01F23/233—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements
    • B01F23/2334—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements provided with stationary guiding means surrounding at least partially the stirrer
    • B01F23/23341—Mixing gases with liquids by introducing gases into liquid media, e.g. for producing aerated liquids using driven stirrers with completely immersed stirring elements provided with stationary guiding means surrounding at least partially the stirrer with tubes surrounding the stirrer
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

Definitions

  • This invention relates to apparatus for contacting a liquid, in a tank containing a body of same, with a gas from a gas space overlying the body of liquid.
  • This invention relates to apparatus for contacting a liquid, in a tank containing a body of same, with a gas from a gas space overlying the body of liquid.
  • the apparatus includes a generally tubular draft member oriented with its central axis aligned vertically, having a cylindrical main body portion and an outwardly flared conical inlet upper section positioned in the tank with the upper end of the conical inlet section forming a liquid inlet positioned proximate to but beneath the normal liquid level in the tank.
  • the lower end of the draft member is vertically spaced from the bottom of the tank to form a liquid outlet.
  • Enclosing walls of the conical inlet section form an angle with the draft member central axis of 5° to 35° and the conical inlet section has a vertical height of from .25. to 1.25 times the diameter of the draft member.
  • a rotatable axial pumping impeller which . has a diameter which is smaller than but at least 90% of the diameter of the draft member.
  • the rotatable axial pumping impeller is positioned in the draft member proximate the juncture of the conical inlet section and the cylindrical main body portion of the draft member for axial downflow pumping of liquid through the draft member and inducement of circulation of liquid discharged from the draft member liquid outlet through the body of liquid in the tank to the draft member liquid inlet.
  • Means are provided for rotating the impeller so as to create a plurality of gas vortices within the conical inlet section of the draft member for vortex entrainment of gas in the downwardly flowing liquid pumped through the draft member.
  • Baffle means are positioned in the conical inlet section of the draft member above the impeller to prevent bulk rotation of the body of liquid in the tank during rotation of the impeller means while permitting the formation of a liquid vortex extending downwardly toward the impeller means for the vortex entrainment of gas, to effect the gas-liquid contacting.
  • normal liquid level means the liquid level in the tank when the aeration apparatus is not in operation.
  • Figure 1 is a sectional, elevational view of an aeration apparatus according to the present invention.
  • the apparatus includes an aeration tank 10, comprising side walls 11 and 12 and a floor 13, which is filled with liquid to be aerated to a level 16 via inlet conduit 14. Aerated, treated fluid is withdrawn from the aeration tank 10 through conduit 15. Across the top of the aeration tank 10 is a bridge 17 on which the motor 18 and gear reduction unit 19 are supported. The motor and gear reduction unit are affixed to bridge 17 through connections 20. Since the rotating speed of the output shaft is optimized in a much higher range than prior art surface aeration devices, the gear ratio can be reduced allowing significant savings in the weight, size and cost of the gear reduction unit 19.
  • the shaft member 30 is connected to the gear reduction unit through bushing 37 in the bridge 17.
  • An axially discharging impeller 32 is connected to the lower end of the shaft member 30.
  • the impeller is a helical screw impeller, although in the broad practice of the present invention the impeller means may suitably comprise a member selected from the group consisting of helical screw impellers, pitched blade turbines, and marine impellers.
  • the shaft/impeller combination is supported within the tank inside a draft member 21.
  • the draft member is supported in the tank by means of support struts 23 and a collar at its lower end and by means of side support members 25 at its intermediate portion.
  • the tension on the side support means can be adjusted by adjusting means 26.
  • the draft member 21 extends from just above the top of the helical impeller down within the tank to near the vessel mid-point.
  • the draft member 21 is generally tubular in form and is oriented with its central axis aligned vertically.
  • the draft member comprises a cylindrical main body portion and an outwardly flared conical inlet upper section 24 positioned in the tank with the upper end of the conical section forming a liquid inlet positioned proximate to but beneath normal liquid level in the tank.
  • the lower end of the draft member is vertically spaced from the bottom of the tank to form a liquid outlet 22.
  • Enclosing walls of the conical inlet section of the draft member form an angle with the draft member central axis of from 5° to 35°.
  • the conical inlet section has a vertical height of from .25 to 1.25 times the diameter D of the draft member, i.e., diameter of the cylindrical body portion.
  • Rotatable axial pumping impeller 32 is employed having a diameter which is smaller than but at least 90% of the diameter of the draft member, and is positioned in the draft member proximate to the juncture of the conical inlet section and the cylindrical main body portion of the draft member.
  • the shaft member 30 is rotated in the direction shown by arrow 33 at a sufficient rate of speed by means of the motor 18 and gear reduction unit 19 so as to depress the liquid level in the conical inlet section 24.
  • the liquid assumes a vortical shape, extending from the liquid surface down into the inlet section.
  • a plurality of gas vortices 31 are formed extending from the surface of the liquid to the impeller 32. Liquid flowing into the main portion of the draft member surrounding the impeller 30, entrains gas bubbles from these gas vortices.
  • the gas drawn into the liquid is then pumped with the liquid down through the draft member 21 by means of impeller 32.
  • inlet guide baffle means 40 are provided in the inlet section 24.
  • baffles are provided symmetrically spaced around the inlet section. For maximum effectiveness, each baffle is set in a radial plane with respect to the draft member.
  • this invention also takes advantage of another entrainment mechanism which will be termed vortical cascade.
  • vortical cascade As the speed of the impeller is increased, the degree of liquid depression within the inlet section 24 also increases. As soon as the liquid funnel grows to a certain limit, the free surface at the inlet section breaks up. The liquid violently cascades toward the center of the funnel and entrains gas from the gas space as would a waterfall. The gas/liquid mixture thus formed is then pumped downwardly by the impeller and is thereafter discharged from the bottom of the draft member.
  • the actual rotational speed where both gas.vortices and vortical cascade are formed will depend on a variety of design factors. The optimum speed, however, will typically lie above about 200 rpm.
  • the impeller To ensure an effective downward pumping of the two-phase gas-liquid mixture, the impeller must have a diameter substantially equal to the diameter D of the draft member. Quantitatively, this means that the impeller must have a diameter of at least 90% of the draft member diameter. When the relationship between the impeller and the diameter is below this limit, there is sufficient clearance between the impeller and the draft member wall to permit gas which has previously been pumped by the impeller to rise upwardly past the impeller along the wall of the draft member. This gas is subsequently re-entrained by the impeller. Since any impeller has well-defined operating characteristics with respect to the pumping of a two-phase mixture, any re-entrainment of previously pumped gas will serve to detrimentally affect the quantity of fresh gas that can be entrained by the device. The eventual result is a drastic reduction in overall mass transfer capabilities of the aeration system.
  • the present invention requires an outwardly flared conical inlet section forming an angle with the draft member central axis of from 5° to 35° and with a vertical height of between .25 and 1.25 times draft member diameter.
  • the conical inlet section serves several essential functions. First, it minimizes adverse inlet turbulence by allowing gradual and essentially uniform increase in liquid flow velocity to the center portion of the draft member inlet, at which point the vortical cascade occurs. Transient turbulence surges disrupting the uniformity.of the flow would grea.tly reduce the pumping efficiency of the impeller means. Second, by flaring the inlet of the draft member, the flow area into the draft member is increased.
  • the liquid flow velocity at the conical inlet section is lower than it is for a cylindrical inlet under similar operating conditions.
  • the conical inlet also makes it easier to stabilize the vortical cascade above the impeller. This is important since it has been found that vortex formation extending down to the impeller should be avoided as it greatly increases power consumption.
  • Conical inlet heights above 1.25 times the draft member diameter necessitate excessive power inputs in order to form and sustain both the gas vortices and the vortical cascade, while conical inlet heights below .25 times the draft tube diameter result in adverse interference between the operation of the impeller and the stable maintenance of both the gas vorticies and the vortical cascade.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Microbiology (AREA)
  • Hydrology & Water Resources (AREA)
  • Chemical Kinetics & Catalysis (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Organic Chemistry (AREA)
  • Mixers Of The Rotary Stirring Type (AREA)
  • Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)
  • Physical Or Chemical Processes And Apparatus (AREA)
EP19800105915 1979-10-02 1980-09-30 Apparat zum in Kontakt Bringen einer Flüssigkeit mit einem Gas Expired EP0026493B1 (de)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
US81041 1979-10-02
US06/081,041 US4328175A (en) 1979-10-02 1979-10-02 Apparatus for contacting a liquid with a gas

Publications (2)

Publication Number Publication Date
EP0026493A1 true EP0026493A1 (de) 1981-04-08
EP0026493B1 EP0026493B1 (de) 1984-06-13

Family

ID=22161745

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19800105915 Expired EP0026493B1 (de) 1979-10-02 1980-09-30 Apparat zum in Kontakt Bringen einer Flüssigkeit mit einem Gas

Country Status (6)

Country Link
US (1) US4328175A (de)
EP (1) EP0026493B1 (de)
JP (1) JPS602898B2 (de)
CA (1) CA1139462A (de)
DE (1) DE3068228D1 (de)
MX (1) MX157941A (de)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0084316A2 (de) * 1982-01-13 1983-07-27 Maschinenfabrik Hellmut Geiger GmbH & Co. KG. Verfahren und Vorrichtung zum Begasen und Umwälzen von Flüssigkeiten
GB2161089A (en) * 1984-06-25 1986-01-08 Isoworth Ltd A water carbonation method and apparatus
AT390944B (de) * 1985-03-15 1990-07-25 Waagner Biro Ag Verfahren und einrichtung zur behandlung einer stroemenden fluessigkeitssaeule mit einem gas
DE4330207A1 (de) * 1993-09-07 1995-03-09 Harry Juengling Verfahren und Vorrichtung zum Belüften und Durchmischen von Flüssigkeit in einem Becken

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USRE32562E (en) * 1982-07-08 1987-12-15 Union Carbide Corporation Process and apparatus for mixing a gas and a liquid
US4454077A (en) * 1982-07-08 1984-06-12 Union Carbide Corporation Process and apparatus for mixing a gas and a liquid
US4900480A (en) * 1986-10-21 1990-02-13 Union Carbide Corporation Gas-liquid mixing
US5004571A (en) * 1990-03-30 1991-04-02 Union Carbide Industrial Gases Technology Corporation Liquid level control in gas-liquid mixing operations
US5213718A (en) * 1991-01-14 1993-05-25 Burgess Harry L Aerator and conversion methods
US5108662A (en) * 1991-05-01 1992-04-28 Union Carbide Industrial Gases Technology Corporation Gas-liquid mixing process and apparatus
JPH0747113B2 (ja) * 1992-09-10 1995-05-24 収蔵 鎌田 液体と気体との攪拌混合装置
US5780683A (en) * 1996-09-11 1998-07-14 Abb Lummus Global Inc. Cyclohexane oxidation
US5783720A (en) 1996-10-10 1998-07-21 Osi Specialties, Inc. Surface-active additives in the direct synthesis of trialkoxysilanes
US6835312B2 (en) * 2001-05-15 2004-12-28 Global Biosciences, Inc. Method and apparatus for treatment of septic systems with alkane-utilizing bacteria
US6923914B2 (en) * 1996-12-17 2005-08-02 Global Biosciences, Inc. Remediation of metal contaminants with hydrocarbon-utilizing bacteria
US20030201227A1 (en) * 1996-12-17 2003-10-30 Perriello Felix Anthony Remediation of odorous media
US7182871B2 (en) * 1996-12-17 2007-02-27 Global Biosciences, Inc. Wastewater treatment with alkanes
US7192523B2 (en) * 1996-12-17 2007-03-20 Global Biosciences, Inc. Methods for treating agricultural waste and producing plant growth-enhancing material
US6669846B2 (en) 1996-12-17 2003-12-30 Global Biosciences, Inc. Wastewater treatment with alkanes
US6460830B1 (en) 1997-01-08 2002-10-08 Carbofil International Device for stirring and aerating a liquid and eliminating foam in a tank for treating said liquid
US5916491A (en) * 1997-01-16 1999-06-29 Rhone-Poulenc, Inc. Gas-liquid vortex mixer and method
US5874003A (en) * 1997-06-25 1999-02-23 Rose; Bryan L. Wastewater treatment apparatus with floating clarifier
US5925290A (en) * 1997-08-08 1999-07-20 Rhone-Poulenc Inc. Gas-liquid venturi mixer
US6362367B2 (en) 1998-04-21 2002-03-26 Union Carbide Chemicals & Plastics Technology Corp. Preparation of organic acids
US6050550A (en) * 1998-07-09 2000-04-18 Burgess; Harry L. Apparatus for aeration and bottom agitation for aqua-culture systems
FR2818162B1 (fr) * 2000-12-20 2003-03-07 Air Liquide Perfectionnement aux procedes d'oxydation par transfert d'oxygene au sein d'un milieu liquide dans un reacteur sous pression
FR2823743B1 (fr) * 2001-04-19 2004-03-12 Alain Boulant Dispositif pour brasser et aerer un liquide dans une cuve de traitement
FR2823742B1 (fr) * 2001-04-19 2004-03-12 Alain Boulant Dispositif pour brasser et aerer un liquide dans une cuve de traitement
US6875356B2 (en) * 2001-07-27 2005-04-05 Global Biosciences, Inc. Method and apparatus for recovery of metals with hydrocarbon-utilizing bacteria
US7329532B2 (en) 2001-07-27 2008-02-12 Global Biosciences, Inc. Remediation of sulfur-containing pollutants with hydrocarbon-utilizing bacteria
US6830700B1 (en) * 2003-07-08 2004-12-14 Kolene Corporation Method and device for removing particles from liquid
US7652164B2 (en) * 2005-09-13 2010-01-26 Momentive Performance Materials Inc. Process for the direct synthesis of trialkoxysilane
US7429672B2 (en) * 2006-06-09 2008-09-30 Momentive Performance Materials Inc. Process for the direct synthesis of trialkoxysilane
GB2451870A (en) * 2007-08-15 2009-02-18 United Utilities Plc Method and Apparatus for Aeration
DE102010023832A1 (de) * 2010-06-10 2011-12-15 Sig Technology Ag Vorrichtung und Verfahren zur Bevorratung von Produkten
EP3039027B1 (de) 2013-08-30 2017-12-06 Momentive Performance Materials Inc. Schlammphasendirektsynthese von organohalogensilanen aus feinen zyklonen
KR20160145285A (ko) * 2015-06-10 2016-12-20 주식회사 한국아쿠오시스 인공 소용돌이 생성장치
DE102015121513A1 (de) * 2015-12-10 2017-06-14 EKATO Rühr- und Mischtechnik GmbH Rührvorrichtung
EP3827313B1 (de) 2018-07-26 2022-05-04 Ricoh Company, Ltd. Reinigungsklinge, prozesskartusche und bilderzeugungsvorrichtung

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AT324363B (de) * 1972-10-17 1975-08-25 Peters & Co Metallwaren Erich Verfahren zur sterilisierung und zur minderung bzw. beseitigung des geruches von organische substanzen enthaltenden flüssigkeiten, insbesondere verdunnter jauche und vorrichtung zur durchführung des verfahrens
DE2730190A1 (de) * 1976-07-27 1978-02-02 Bucher Guyer Ag Masch Vorrichtung fuer einen behaelter zum belueften von zur schaumbildung neigenden fluessigkeiten

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Patent Citations (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE743984C (de) * 1938-09-16 1944-01-06 Eugen Stich Verfahren und Vorrichtung zum Belueften von Gaerfluessigkeiten
AT324363B (de) * 1972-10-17 1975-08-25 Peters & Co Metallwaren Erich Verfahren zur sterilisierung und zur minderung bzw. beseitigung des geruches von organische substanzen enthaltenden flüssigkeiten, insbesondere verdunnter jauche und vorrichtung zur durchführung des verfahrens
DE2730190A1 (de) * 1976-07-27 1978-02-02 Bucher Guyer Ag Masch Vorrichtung fuer einen behaelter zum belueften von zur schaumbildung neigenden fluessigkeiten

Cited By (6)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP0084316A2 (de) * 1982-01-13 1983-07-27 Maschinenfabrik Hellmut Geiger GmbH & Co. KG. Verfahren und Vorrichtung zum Begasen und Umwälzen von Flüssigkeiten
EP0084316B1 (de) * 1982-01-13 1985-12-11 Maschinenfabrik Hellmut Geiger GmbH & Co. KG. Verfahren und Vorrichtung zum Begasen und Umwälzen von Flüssigkeiten
GB2161089A (en) * 1984-06-25 1986-01-08 Isoworth Ltd A water carbonation method and apparatus
US4719056A (en) * 1984-06-25 1988-01-12 Isoworth Limited Fluid treatment
AT390944B (de) * 1985-03-15 1990-07-25 Waagner Biro Ag Verfahren und einrichtung zur behandlung einer stroemenden fluessigkeitssaeule mit einem gas
DE4330207A1 (de) * 1993-09-07 1995-03-09 Harry Juengling Verfahren und Vorrichtung zum Belüften und Durchmischen von Flüssigkeit in einem Becken

Also Published As

Publication number Publication date
JPS5697531A (en) 1981-08-06
DE3068228D1 (en) 1984-07-19
CA1139462A (en) 1983-01-11
EP0026493B1 (de) 1984-06-13
MX157941A (es) 1988-12-26
JPS602898B2 (ja) 1985-01-24
US4328175A (en) 1982-05-04

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